On 2015년 12월 14일 17:40, MyungJoo Ham wrote: >> >> This patch adds the documentation for generic exynos bus frequency >> driver. >> >> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> >> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> > > A little changes following: > >> --- >> .../devicetree/bindings/devfreq/exynos-bus.txt | 93 ++++++++++++++++++++++ >> 1 file changed, 93 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/devfreq/exynos-bus.txt >> >> diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt >> new file mode 100644 >> index 000000000000..e32daef328da >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt >> @@ -0,0 +1,93 @@ >> +* Generic Exynos Bus frequency device >> + >> +The Samsung Exynos SoC have many buses for data transfer between DRAM > > +The Samsung Exynos SoC has many buses for data transfer between DRAM > > or > > +The Samsung Exynos SoCs have many buses for data transfer between DRAM > (because you intend to support mulitple Exynos SoCs) > >> +and sub-blocks in SoC. Almost Exynos SoC have the common architecture > > +and sub-blocks in SoC. Most Exynos SoCs share the common architecture > >> +for buses. Generally, the each bus of Exynos SoC includes the source clock > > +for buses. Generally, each bus of Exynos SoC includes a source clock > >> +and power line and then is able to change the clock according to the usage > > +and a power line, which are able to change the clock frequency > >> +of each buses on runtime. When gathering the usage of each buses on runtime, > > +of the bus in runtime. To monitor the usage of each bus in runtime, > >> +the driver uses the PPMU (Platform Performance Monitoring Unit) which > > +the driver uses the PPMU (Platform Performance Monitoring Unit), which > >> +is able to measure the current load of sub-blocks. >> + >> +There are a little different composition among Exynos SoC because each Exynos >> +SoC has the different sub-blocks. So, this difference should be specified > > +SoC has different sub-blocks. Therefore, such difference should be specified > >> +in devicetree file instead of each device driver. In result, this driver >> +is able to support the bus frequency for all Exynos SoCs. >> + Okay. I'll modify it. Regards, Chanwoo Choi -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
